L-Leucine 4K is an essential amino acid meaning it cannot be synthesised by the human body and therefore, must be consumed through the dietary food intake or in supplement form. L-Leucine is the primary and most abundant out of the three Branched Chain Amino Acids (BCAAs). This is commonly found in high amounts in many animal-based foods such as lean meats, poultry and fish. L-Leucine tablets are ideal for anyone taking part in intense physical activity. These can be taken either before or after a workout. It is recommended to take one serving daily preferably with food. For optimal results on training days consume one serving 45 minutes prior to exercise and one serving post exercise. Check with a qualified health professional before using this product if you are under the age of 18, pregnant or nursing a baby or if you have any known or suspected medical condition(s) and or are taking any prescription or OTC medication(s). Not to be used as a substitute for a varied diet and healthy lifestyle. Do not exceed suggested use. Store this product in a cool dry place, away from children.